/Engine/Source/Runtime/Core/Public/String/Join.h
namespace UE { namespace String { namespace Private { template<typename RangeType, typename ProjectionType, typename DelimiterType, typename CharType> [TStringBuilderBase](API\Runtime\Core\Containers\TStringBuilderBase)< CharType > & UE::String::Private::operator<< ( [TStringBuilderBase](API\Runtime\Core\Containers\TStringBuilderBase)< CharType > & Builder, [Private::TJoinBy](API\Runtime\Core\String\TJoinBy)< RangeType, ProjectionType, DelimiterType > && Adapter ) } } }